/Engine/Source/Runtime/Engine/Classes/Engine/AssetManager.h
Gets list of allFPrimaryAssetIdfor a primary asset type, returns true if any were found
virtual bool GetPrimaryAssetIdList ( [FPrimaryAssetType](API\Runtime\CoreUObject\UObject\FPrimaryAssetType) PrimaryAssetType, [TArray](API\Runtime\Core\Containers\TArray)< [FPrimaryAssetId](API\Runtime\CoreUObject\UObject\FPrimaryAssetId) > & PrimaryAssetIdList, EAssetManagerFilter Filter ) const